Note 7 - Marketable Securities - Summary of Investments (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Equity securities, cost	$ 6,886,789	$ 7,466,168
Equity securities	6,410,082	7,635,463
Equity securities, unrealized gain	(476,707)	169,295
Marketable securities, cost	6,886,789	7,466,168
Marketable securities	6,410,082	7,635,463
Marketable securities, unrealized gain	(476,707)	169,295
Fixed Income Securities [Member]
Equity securities, cost	6,214,590	6,814,420
Equity securities	5,722,563	6,873,333
Equity securities, unrealized gain	(492,027)	58,913
Equity And Other Mutual Funds [Member]
Equity securities, cost	672,199	651,748
Equity securities	687,519	762,130
Equity securities, unrealized gain	$ 15,320	$ 110,382

Cost of investment in debt securities classified as held to maturity and equity securities.

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Fair value of investment in debt securities classified as held to maturity and equity securities.

+ References

No definition available.

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- Definition

Amount of accumulated unrealized gain (loss) in debt securities classified as held to maturity and equity securities.

+ References

No definition available.

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Accumulated amount of unrealized gain (loss) on equity securities.

+ References

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (f)
-URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

+ References

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